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            <h1>CLIP テキストエンベダー</h1>
<p><a href="../index.html">これを使うと、高速に埋め込むことができ、安定した拡散が得られます。</a>ハギングフェイストランスフォーマーCLIPモデルを使用しています</p>。

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            <div class="highlight"><pre><span class="lineno">14</span><span></span><span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">List</span>
<span class="lineno">15</span>
<span class="lineno">16</span><span class="kn">from</span> <span class="nn">torch</span> <span class="kn">import</span> <span class="n">nn</span>
<span class="lineno">17</span><span class="kn">from</span> <span class="nn">transformers</span> <span class="kn">import</span> <span class="n">CLIPTokenizer</span><span class="p">,</span> <span class="n">CLIPTextModel</span></pre></div>
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            <h2>CLIP テキストエンベダー</h2>

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            <div class="highlight"><pre><span class="lineno">20</span><span class="k">class</span> <span class="nc">CLIPTextEmbedder</span><span class="p">(</span><span class="n">nn</span><span class="o">.</span><span class="n">Module</span><span class="p">):</span></pre></div>
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            <ul><li><code  class="highlight"><span></span><span class="n">version</span></code>
モデルバージョンです</li>
<li><code  class="highlight"><span></span><span class="n">device</span></code>
デバイスです</li>
<li><code  class="highlight"><span></span><span class="n">max_length</span></code>
トークン化されたプロンプトの最大長です</li></ul>

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        <div class='code'>
            <div class="highlight"><pre><span class="lineno">25</span>    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">version</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s2">&quot;openai/clip-vit-large-patch14&quot;</span><span class="p">,</span> <span class="n">device</span><span class="o">=</span><span class="s2">&quot;cuda:0&quot;</span><span class="p">,</span> <span class="n">max_length</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">77</span><span class="p">):</span></pre></div>
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        <div class='code'>
            <div class="highlight"><pre><span class="lineno">31</span>        <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">()</span></pre></div>
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            <p>トークナイザーをロード</p>

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            <div class="highlight"><pre><span class="lineno">33</span>        <span class="bp">self</span><span class="o">.</span><span class="n">tokenizer</span> <span class="o">=</span> <span class="n">CLIPTokenizer</span><span class="o">.</span><span class="n">from_pretrained</span><span class="p">(</span><span class="n">version</span><span class="p">)</span></pre></div>
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            <p>CLIP トランスをロードします</p>

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            <div class="highlight"><pre><span class="lineno">35</span>        <span class="bp">self</span><span class="o">.</span><span class="n">transformer</span> <span class="o">=</span> <span class="n">CLIPTextModel</span><span class="o">.</span><span class="n">from_pretrained</span><span class="p">(</span><span class="n">version</span><span class="p">)</span><span class="o">.</span><span class="n">eval</span><span class="p">()</span>
<span class="lineno">36</span>
<span class="lineno">37</span>        <span class="bp">self</span><span class="o">.</span><span class="n">device</span> <span class="o">=</span> <span class="n">device</span>
<span class="lineno">38</span>        <span class="bp">self</span><span class="o">.</span><span class="n">max_length</span> <span class="o">=</span> <span class="n">max_length</span></pre></div>
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            <ul><li><code  class="highlight"><span></span><span class="n">prompts</span></code>
埋め込むプロンプトのリストです</li></ul>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">40</span>    <span class="k">def</span> <span class="nf">forward</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">prompts</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">]):</span></pre></div>
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            <p>プロンプトをトークン化</p>

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        <div class='code'>
            <div class="highlight"><pre><span class="lineno">45</span>        <span class="n">batch_encoding</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">tokenizer</span><span class="p">(</span><span class="n">prompts</span><span class="p">,</span> <span class="n">truncation</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">max_length</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">max_length</span><span class="p">,</span> <span class="n">return_length</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span>
<span class="lineno">46</span>                                        <span class="n">return_overflowing_tokens</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">padding</span><span class="o">=</span><span class="s2">&quot;max_length&quot;</span><span class="p">,</span> <span class="n">return_tensors</span><span class="o">=</span><span class="s2">&quot;pt&quot;</span><span class="p">)</span></pre></div>
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            <p>トークン ID を取得</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">48</span>        <span class="n">tokens</span> <span class="o">=</span> <span class="n">batch_encoding</span><span class="p">[</span><span class="s2">&quot;input_ids&quot;</span><span class="p">]</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">device</span><span class="p">)</span></pre></div>
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            <p>CLIP 埋め込みを取得</p>

        </div>
        <div class='code'>
            <div class="highlight"><pre><span class="lineno">50</span>        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">transformer</span><span class="p">(</span><span class="n">input_ids</span><span class="o">=</span><span class="n">tokens</span><span class="p">)</span><span class="o">.</span><span class="n">last_hidden_state</span></pre></div>
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